{"id":"goussanou-2016-generic-stem-volume-d","source":{"id":"goussanou-2016","citation":"Goussanou, C.A., Guendehou, S., Assogbadjo, A.E., Kaire, M., Sinsin, B., Cuni-Sanchez, A. (2016). Specific and generic stem biomass and volume models of tree species in a West African tropical semi-deciduous forest. Silva Fennica, 50(2), article id 1474.","title":"Specific and generic stem biomass and volume models of tree species in a West African tropical semi-deciduous forest","authors":["Goussanou, C.A.","Guendehou, S.","Assogbadjo, A.E."],"year":2016,"venue":"Silva Fennica","doi":"10.14214/sf.1474","url":"https://doi.org/10.14214/sf.1474","read_url":"https://silvafennica.fi/pdf/1474","access":"open","checked_at":"2026-11-02","status":"current","notes":"Read the full open PDF. Eight equations captured: the Dbh-only stem biomass models (Table 4) for the generic fit and for six of the eighteen species (T. superba, T. scleroxylon, K. senegalensis, A. zygia, C. congoensis, H. grandis), plus the generic Dbh-only stem volume model (Table 3). Not captured: the Dbh + stem-height models (H in the paper is stem height to crown base, not total height, so it is not the canonical H), the other twelve species, and the species volume models. Non-destructive sampling (diameters measured along standing trees, volume by truncated cones, times basic wood density)."},"name":"Generic stem volume from Dbh (Lama forest)","output":{"quantity":"stem_volume"},"expression":"0.001 * exp(-1.48 + 2.29 * ln(D) + 0.05)","published":{"expression":"exp(-1.48 + 2.29 * ln(Dbh) + 0.05)","units":{"Dbh":"cm"},"variables":{"Dbh":"D"},"output_unit":"dm3"},"taxon":{"level":"mixed","name":"Eighteen dominant tree species of Lama forest plus species from Guendehou et al. (2012)","group":"broadleaf"},"region":{"scope":"site","countries":["BJ"],"place":"Lama forest reserve, southern Benin (semi-deciduous forest)","biomes":["tropical"]},"stand":"natural","fit":{"n_trees":617,"method":"ln-ln linear regression, back-transformed with exp(σ²/2) (printed σ²/2 is rounded to 2 decimals)"},"evidence":[{"field":"expression","quote":"Generic –1.48*** (0.04) 2.29*** (0.01) 97.51 32 0.05 615","locator":"Eq. 3 and 5, p. 7; Table 3 (Model structure: ln(V) = x0 + x1ln(Dbh)), p. 9"},{"field":"fit.n_trees","quote":"This resulted in 617 trees used for the generic volume and biomass models.","locator":"Section 2.3, p. 7"}],"check":[{"inputs":{"D":20},"expected":0.2282,"origin":"computed","note":"computed from the published form (coefficients as printed to 2 decimals)"},{"inputs":{"D":40},"expected":1.116,"origin":"computed","note":"computed from the published form (coefficients as printed to 2 decimals)"}],"verification":"original_read","checked_at":"2026-11-02","notes":"Total stem volume (stem = height to crown base), not whole-tree volume. Paper unit is 10^-3 m3 (= dm3); canonical expression converts to m3. Coefficients are printed to 2 decimals, so predictions are only as precise as that. σ²/2 is the paper's printed bias-correction term, added inside the exponent (Eq. 5); it is printed rounded to 2 decimals. Adjusted R² 97.51%, rRMSE 32% (Table 3). Fitted on 617 trees (this study plus Guendehou et al. 2012). "}